GCN Circular 10343
Subject
GRB 100117A: Optical object inside the revised XRT error circle
Date
2010-01-18T16:23:10Z (15 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. Alexander Kann (TLS Tautenburg), D. Malesani (DARK/NBI), D. Xu (WIS,
DARK/NBI) report on behalf of a larger collaboration:
Using the improved XRT position (B. Sbarufatti et al. GCN 10342) for the
Swift short/hard GRB 100117A (M. de Pasquale et al., GCN 10336), we find
that the afterglow candidate reported from NOT observations (D. Xu et al.,
GCN 10337), which is probably identical to source "S1" from S. B. Cenko et
al. (GCN 10339), lies outside the error circle. We therefore consider it
unlikely that this object is related to the GRB, also considering the lack
of pronounced variability (S. B. Cenko et al. GCN 10339).
Of the four sources reported by S. B. Cenko et al. (GCN 10339) and
confirmed by R. Chornock et al. (GCN 10340) and A. Cucchiara et al. (GCN
10341), only source "S3" still lies within the new XRT error circle.
Source S3, which is extended according to the above reports, may be the
host galaxy of GRB 100117A, although lack of variability does not allow a
conclusive statement.
An additional image epoch to perform image subtraction is encouraged.
This message may be cited.